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A 230-volt LED filament lamp, with an E27 base. The filaments are visible as the eight yellow vertical lines. An assortment of LED lamps commercially available in 2010: floodlight fixtures (left), reading light (center), household lamps (center right and bottom), and low-power accent light (right) applications An 80W Chips on board (COB) LED module from an industrial light luminaire, thermally ...
lux (= lumen per square metre) lx (= lm/m 2) L −2 ⋅J: Luminous flux incident on a surface Luminous exitance, luminous emittance M v: lumen per square metre lm/m 2: L −2 ⋅J: Luminous flux emitted from a surface Luminous exposure: H v: lux second: lx⋅s L −2 ⋅T⋅J: Time-integrated illuminance Luminous energy density ω v: lumen ...
In July 2008 the U.S. EPA published a data sheet stating that the net system emission of mercury for CFL lighting was lower than for incandescent lighting of comparable lumen output. This was based on the average rate of mercury emission for U.S. electricity production and average estimated escape of mercury from a CFL put into a landfill. [85]
Seattle (/ s i ˈ æ t əl / ⓘ See-AT-uhl) is a city on the West Coast of the United States.It is the seat of King County, Washington.With a 2023 population of 755,078 [3] it is the most populous city in both the state of Washington and the Pacific Northwest region of North America, and the 18th-most populous city in the United States.
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An astronaut once observed a great white light shining out from the bottom of our world: Antarctica, the ice-covered continent we are only just beginning to understand. NOVA visits this wilderness of ice, larger than the United States and Mexico combined, whose only warm-blooded residents are seals , skuas , penguins and scientists.